[Users] How to obtain the plugins?

[Dick Ruck]

I am using Linux Mint 18.1 Serena. I initially installed Claws using
the software manager and successfully added the archiver plugin.
However I could not install the spamassassin plugin. I then downloaded
Claws 3.14.1 and complied/installed it.
I then discovered that, although it had the spamassassin plugin, it did
not have the archiver plugin.
When I access the plugins page:
(http://www.claws-mail.org/plugins.php?section=downloads) I cannot find
any way to download the plugins, either with Firefox or Chromium.

Are there other methods of obtaining the plugins?

TIA

Dick